Are you sure the link links to the article about Halic?
I may sound like a dumb Polish... but where is Halic on the map?

Halic is the famous "Golden Horn".
The Golden Horn features in many works of literature dealing with classical themes. For example, G. K. Chesterton's poem Lepanto contains the memorable couplet "From evening isles fantastical rings faint the Spanish gun, And the Lord upon the Golden Horn is laughing in the sun"
(From wikipedia)
With the industrialization of Istanbul it became polluted.